System.Numerics.Tests.Perf_BigInteger.Ctor_ByteArray benchmark crashes when profiling ETW

When I try to run the `System.Numerics.Tests.Perf_BigInteger.Ctor_ByteArray` benchmark and collect an ETW trace, the benchmark crashes. I'm running the benchmark using the following command:

```cmd
py .\scripts\benchmarks_ci.py -c Release -f netcoreapp5.0 --filter '*System.Numerics.Tests.Perf_BigInteger.Ctor_ByteArray*' --bdn-arguments '-p ETW'
```

The benchmarks start running, but towards the end it throws the following error:

```
// **************************
[2020/08/26 12:40:08][INFO] // Benchmark: Perf_BigInteger.Ctor_ByteArray: Job-VWENRA(PowerPlanMode=00000000-0000-0000-0000-000000000000, Runtime=.NET Core 5.0, Arguments=/p:DebugType=portable, Toolchain=netcoreapp5.0, IterationTime=250.0000 ms, MaxIterationCount=20, MinIterationCount=15, WarmupCount=1) [numberString=123456789012(...)901234567890 [200]]
[2020/08/26 12:40:08][INFO] // *** Execute ***
[2020/08/26 12:40:08][INFO] // Launch: 1 / 1
[2020/08/26 12:40:08][INFO] // Execute: dotnet "13a368b9-dfba-4cd3-9940-06fdcc587b0d.dll" --benchmarkName "System.Numerics.Tests.Perf_BigInteger.Ctor_ByteArray(numberString: 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890)" --job "PowerPlanMode=00000000-0000-0000-0000-000000000000, Runtime=.NET Core 5.0, Arguments=/p:DebugType=portable, Toolchain=netcoreapp5.0, IterationTime=250.0000 ms, MaxIterationCount=20, MinIterationCount=15, WarmupCount=1" --benchmarkId 2 in C:\Users\acovingt\source\repos\performance\artifacts\bin\MicroBenchmarks\Release\netcoreapp5.0\13a368b9-dfba-4cd3-9940-06fdcc587b0d\bin\Release\netcoreapp5.0
[2020/08/26 12:40:08][INFO] Unhandled exception. System.IO.FileNotFoundException: Unspecified error
[2020/08/26 12:40:08][INFO]
[2020/08/26 12:40:08][INFO] at System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode)
[2020/08/26 12:40:08][INFO] at Microsoft.Diagnostics.Tracing.Session.TraceEventSession.EnableKernelProvider(Keywords flags, Keywords stackCapture)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Diagnostics.Windows.KernelSession.EnableProviders()
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Diagnostics.Windows.EtwProfiler.Start(DiagnoserActionParameters parameters)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Diagnostics.Windows.EtwProfiler.Handle(HostSignal signal, DiagnoserActionParameters parameters)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Diagnosers.CompositeDiagnoser.Handle(HostSignal signal, DiagnoserActionParameters parameters)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Toolchains.DotNetCli.DotNetCliExecutor.Execute(BenchmarkCase benchmarkCase, BenchmarkId benchmarkId, ILogger logger, ArtifactsPaths artifactsPaths, IDiagnoser diagnoser, String executableName, IResolver resolver)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Toolchains.DotNetCli.DotNetCliExecutor.Execute(ExecuteParameters executeParameters)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Running.BenchmarkRunnerClean.Execute(ILogger logger, BenchmarkCase benchmarkCase, BenchmarkId benchmarkId, IToolchain toolchain, BuildResult buildResult, IResolver resolver)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Running.BenchmarkRunnerClean.RunCore(BenchmarkCase benchmarkCase, BenchmarkId benchmarkId, ILogger logger, IResolver resolver, BuildResult buildResult)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Running.BenchmarkRunnerClean.Run(BenchmarkRunInfo benchmarkRunInfo, Dictionary`2 buildResults, IResolver resolver, ILogger logger, List`1 artifactsToCleanup, String resultsFolderPath, String logFilePath, StartedClock& runChronometer)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Running.BenchmarkRunnerClean.Run(BenchmarkRunInfo[] benchmarkRunInfos)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Running.BenchmarkSwitcher.RunWithDirtyAssemblyResolveHelper(String[] args, IConfig config)
[2020/08/26 12:40:08][INFO] at BenchmarkDotNet.Running.BenchmarkSwitcher.Run(String[] args, IConfig config)
[2020/08/26 12:40:08][INFO] at MicroBenchmarks.Program.Main(String[] args) in C:\Users\acovingt\source\repos\performance\src\benchmarks\micro\Program.cs:line 41
```

If I omit the `--bdn-arguments '-p ETW'`, it doesn't crash.

Here's the `dotnet --info` output from `benchmarks_ci.py` for extra context:

```
[2020/08/26 12:39:05][INFO] $ dotnet --info
[2020/08/26 12:39:06][INFO] .NET SDK (reflecting any global.json):
[2020/08/26 12:39:06][INFO] Version: 6.0.100-alpha.1.20426.4
[2020/08/26 12:39:06][INFO] Commit: e8e3c763bf
[2020/08/26 12:39:06][INFO]
[2020/08/26 12:39:06][INFO] Runtime Environment:
[2020/08/26 12:39:06][INFO] OS Name: Windows
[2020/08/26 12:39:06][INFO] OS Version: 10.0.19041
[2020/08/26 12:39:06][INFO] OS Platform: Windows
[2020/08/26 12:39:06][INFO] RID: win10-x64
[2020/08/26 12:39:06][INFO] Base Path: C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk\6.0.100-alpha.1.20426.4\
[2020/08/26 12:39:06][INFO]
[2020/08/26 12:39:06][INFO] Host (useful for support):
[2020/08/26 12:39:06][INFO] Version: 5.0.0-rc.1.20417.14
[2020/08/26 12:39:06][INFO] Commit: 907f7da59b
[2020/08/26 12:39:06][INFO]
[2020/08/26 12:39:06][INFO] .NET SDKs installed:
[2020/08/26 12:39:06][INFO] 3.1.303 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 5.0.100-rc.1.20407.13 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 5.0.100-rc.1.20411.2 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 5.0.100-rc.1.20413.9 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 5.0.100-rc.1.20418.3 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 5.0.100-rc.1.20419.9 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 5.0.100-rc.1.20420.16 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 6.0.100-alpha.1.20421.6 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO] 6.0.100-alpha.1.20426.4 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\sdk]
[2020/08/26 12:39:06][INFO]
[2020/08/26 12:39:06][INFO] .NET runtimes installed:
[2020/08/26 12:39:06][INFO] Microsoft.AspNetCore.App 3.1.6 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.AspNetCore.App]
[2020/08/26 12:39:06][INFO] Microsoft.AspNetCore.App 5.0.0-rc.1.20405.9 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.AspNetCore.App]
[2020/08/26 12:39:06][INFO] Microsoft.AspNetCore.App 5.0.0-rc.1.20419.22 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.AspNetCore.App]
[2020/08/26 12:39:06][INFO] Microsoft.NETCore.App 3.1.6 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.NETCore.App]
[2020/08/26 12:39:06][INFO] Microsoft.NETCore.App 5.0.0-rc.1.20404.16 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.NETCore.App]
[2020/08/26 12:39:06][INFO] Microsoft.NETCore.App 5.0.0-rc.1.20417.14 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.NETCore.App]
[2020/08/26 12:39:06][INFO] Microsoft.WindowsDesktop.App 3.1.6 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.WindowsDesktop.App]
[2020/08/26 12:39:06][INFO] Microsoft.WindowsDesktop.App 5.0.0-rc.1.20405.1 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.WindowsDesktop.App]
[2020/08/26 12:39:06][INFO] Microsoft.WindowsDesktop.App 5.0.0-rc.1.20417.4 [C:\Users\acovingt\source\repos\performance\tools\dotnet\x64\shared\Microsoft.WindowsDesktop.App]
```

Please let me know if I can clarify any of the above. Thanks in advance!